help please
#3
Evolved Member
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I doubt an exhaust will cause any serious leaning conditions nor would a flash for a catless w/t the cat temp installed cause you to flunk a **** test, but ask your tuner just in case. An intake however, such as the HKS RS, will cause lean conditions but DF has a nice tune for those units for you to get some #s.
The worthless cat factory installed on the evo locks up lots of performance: when I replaced mine w/t a test pipe and a cell fix, I had to turn the boost down because I gained a solid 1 to 1.5 psi and my 3rd gear 30-70mph pulls were 10% quicker.
Make sure you have some spare 3" gaskets and a torque wrench if your going to be temp intalling that cat once a year and also test for exhaust leaks.
PS the factory cat bolts are a ***** to loosen, I had to get a 2' breaker bar
Also the best way to make sure you don't lean out unexpectantly is to get a walbro 255lph fuel pump, make sure it's installed correctly. The stocker is only good for a stock evo
The worthless cat factory installed on the evo locks up lots of performance: when I replaced mine w/t a test pipe and a cell fix, I had to turn the boost down because I gained a solid 1 to 1.5 psi and my 3rd gear 30-70mph pulls were 10% quicker.
Make sure you have some spare 3" gaskets and a torque wrench if your going to be temp intalling that cat once a year and also test for exhaust leaks.
PS the factory cat bolts are a ***** to loosen, I had to get a 2' breaker bar
Also the best way to make sure you don't lean out unexpectantly is to get a walbro 255lph fuel pump, make sure it's installed correctly. The stocker is only good for a stock evo
#6
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Originally Posted by bbyevo8u
thanks Stevdalpiaz
this might sound dumb but would i be able to get away with know flash and know fuel pump and run just a test pipe and a catback and have know leaner or richer conditions?
or is that bad?
this might sound dumb but would i be able to get away with know flash and know fuel pump and run just a test pipe and a catback and have know leaner or richer conditions?
or is that bad?
Exhaust has NOTHING TO DO WITH YOUR AFRs!!!!!
KNOW is not the same word as NO!!!!!!!!!!!!
#7
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Originally Posted by bbyevo8u
thanks Stevdalpiaz
this might sound dumb but would i be able to get away with know flash and know fuel pump and run just a test pipe and a catback and have know leaner or richer conditions?
or is that bad?
this might sound dumb but would i be able to get away with know flash and know fuel pump and run just a test pipe and a catback and have know leaner or richer conditions?
or is that bad?
If by "know" you mean "no", you'll be fine.